I'm not sure I understand the question. There's plenty of code that opens other windows, and none that opens a window that is declared within the NetTalk DLL. Before narrowing it down to NetMain, I had wrapped every OPEN(Window) within the application with a check of the STATUS, and sent that out to the client having the issue, and the debug code was never triggered.
This client has reported that after installing several Microsoft Updates he no longer has the issue.